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| All Patents in class 417/302 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,215,071 | Feb. 06, 1917 | G.F. Steedman | Unloading-Valve for Compressors | compressor relief valves | |
| 1,621,495 | Mar. 22, 1927 | C.M. Conradson | Rotary Pump | rotary pumps | |